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try repartitioning your usb drive with gparted, or gparted live cd.
try dd if=/dev/random | dd of=/dev/your_usb_drive
what is the procedure you're using to make the drive bootable?
Generally, you should modify the syslinux/syslinux.cfg file to mirror your configuration (location of kernel etc). then run ./bootinst.sh

I find it hard to believe the usb is useless. Boot a live backtrack cd and run dmesg to see what its called. In my example we will assume its /dev/sdd
try these commands in a shell.
fdisk /dev/sdd
d
1
n
p
1
<enter>
<enter>
w
then when the prompt returns..
mkdosfs -F 32 /dev/sdd

try repartitioning your usb drive with gparted, or gparted live cd.
try dd if=/dev/random | dd of=/dev/your_usb_drive
what is the procedure you're using to make the drive bootable?
Generally, you should modify the syslinux/syslinux.cfg file to mirror your configuration (location of kernel etc). then run ./bootinst.sh

I'm about to give up. I tried everything! It shows that my installation is well done, all i need is to restart & boot from BIOS. My BIOS shows USB 2.0, i click it - It fails to boot! Weird.

I find it hard to believe the usb is useless. Boot a live backtrack cd and run dmesg to see what its called. In my example we will assume its /dev/sdd
try these commands in a shell.
fdisk /dev/sdd
d
1
n
p
1
<enter>
<enter>
w
then when the prompt returns..
mkdosfs -F 32 /dev/sdd

After that you should be able to see it in winders again.

hm, ok! I got one more question, i'm following one of the tutorials. I saw that after backtrack works from USB, i should go to syslinux.cfg & do some changes, why do we have to do it?